CA1178210A - Noise reduction circuit - Google Patents
Noise reduction circuitInfo
- Publication number
- CA1178210A CA1178210A CA000385054A CA385054A CA1178210A CA 1178210 A CA1178210 A CA 1178210A CA 000385054 A CA000385054 A CA 000385054A CA 385054 A CA385054 A CA 385054A CA 1178210 A CA1178210 A CA 1178210A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- circuit
- level
- input
- circuit according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000009467 reduction Effects 0.000 title claims abstract description 55
- 230000000694 effects Effects 0.000 claims abstract description 16
- 230000004044 response Effects 0.000 claims abstract description 12
- 239000000306 component Substances 0.000 claims description 44
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 abstract description 11
- 230000005291 magnetic effect Effects 0.000 description 18
- 230000006870 function Effects 0.000 description 15
- 239000000543 intermediate Substances 0.000 description 14
- 230000006835 compression Effects 0.000 description 13
- 238000007906 compression Methods 0.000 description 13
- 230000001419 dependent effect Effects 0.000 description 9
- 230000000295 complement effect Effects 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 4
- 238000007792 addition Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- FZKWRPSUNUOXKJ-CVHRZJFOSA-N (4s,4ar,5s,5ar,6r,12ar)-4-(dimethylamino)-1,5,10,11,12a-pentahydroxy-6-methyl-3,12-dioxo-4a,5,5a,6-tetrahydro-4h-tetracene-2-carboxamide;hydrate Chemical compound O.C1=CC=C2[C@H](C)[C@@H]([C@H](O)[C@@H]3[C@](C(O)=C(C(N)=O)C(=O)[C@H]3N(C)C)(O)C3=O)C3=C(O)C2=C1O FZKWRPSUNUOXKJ-CVHRZJFOSA-N 0.000 description 1
- VREFGVBLTWBCJP-UHFFFAOYSA-N alprazolam Chemical compound C12=CC(Cl)=CC=C2N2C(C)=NN=C2CN=C1C1=CC=CC=C1 VREFGVBLTWBCJP-UHFFFAOYSA-N 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000011073 invertase Nutrition 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55121208A JPS5746517A (en) | 1980-09-03 | 1980-09-03 | Noise reduction circuit |
| JP121208/80 | 1980-09-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178210A true CA1178210A (en) | 1984-11-20 |
Family
ID=14805543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000385054A Expired CA1178210A (en) | 1980-09-03 | 1981-09-02 | Noise reduction circuit |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4427950A (OSRAM) |
| JP (1) | JPS5746517A (OSRAM) |
| KR (1) | KR880000597B1 (OSRAM) |
| AT (1) | AT374938B (OSRAM) |
| BE (1) | BE890183A (OSRAM) |
| CA (1) | CA1178210A (OSRAM) |
| CH (1) | CH653795A5 (OSRAM) |
| DE (1) | DE3134669C2 (OSRAM) |
| FR (1) | FR2489573B1 (OSRAM) |
| GB (1) | GB2083985B (OSRAM) |
| IT (1) | IT1138559B (OSRAM) |
| NL (1) | NL191723C (OSRAM) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012858U (ja) * | 1983-07-04 | 1985-01-28 | 日本ビクター株式会社 | ノイズリダクシヨン回路 |
| US4795025A (en) * | 1985-06-28 | 1989-01-03 | Kabushiki Kaisha Toshiba | Parts feeding apparatus of the piezoelectric drive type |
| JP3436777B2 (ja) * | 1993-08-11 | 2003-08-18 | パイオニア株式会社 | ノイズリダクションシステムにおける再生ポジション選択方法および装置 |
| WO1998010590A1 (fr) * | 1996-09-02 | 1998-03-12 | Sony Corporation | Dispositif et procede de transmission d'un signal video |
| KR100213073B1 (ko) * | 1996-11-09 | 1999-08-02 | 윤종용 | 재생 오디오 신호의 주파수 특성 보상 장치 |
| KR100667852B1 (ko) * | 2006-01-13 | 2007-01-11 | 삼성전자주식회사 | 휴대용 레코더 기기의 잡음 제거 장치 및 그 방법 |
| JP4813189B2 (ja) * | 2006-01-23 | 2011-11-09 | 株式会社リコー | 高調波抑制回路 |
| EP1857902A1 (en) * | 2006-05-18 | 2007-11-21 | Saab Ab | Method and device for controlling backlash |
| JP5882253B2 (ja) | 2013-04-23 | 2016-03-09 | 高千穂産業株式会社 | 長尺物品の位置測定方法 |
| CN105656442A (zh) * | 2014-11-21 | 2016-06-08 | 中兴通讯股份有限公司 | 一种增益处理方法和装置 |
| DE102015110460B4 (de) * | 2015-06-30 | 2017-01-19 | Schmidhauser Ag | Erkennung eines Netzphasenausfalls bei Umrichtern mit einer Frequenzdetektion in der Zwischenkreisspannung |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3678416A (en) * | 1971-07-26 | 1972-07-18 | Richard S Burwen | Dynamic noise filter having means for varying cutoff point |
| CA955532A (en) * | 1971-04-16 | 1974-10-01 | Masao Tomita | Automatic noise reduction system |
| JPS52142409A (en) * | 1976-05-21 | 1977-11-28 | Toshiba Corp | Noise reduction system |
| DE2747415C3 (de) * | 1976-10-21 | 1981-05-14 | Tokyo Shibaura Electric Co., Ltd., Kawasaki, Kanagawa | Rauschunterdrückungssystem |
| US4101849A (en) * | 1976-11-08 | 1978-07-18 | Dbx, Inc. | Adaptive filter |
| JPS5439516A (en) | 1977-09-02 | 1979-03-27 | Sanyo Electric Co Ltd | Noise reduction unit |
| JPS56106433A (en) * | 1980-01-28 | 1981-08-24 | Sony Corp | Noise reducing circuit |
| US4337445A (en) * | 1981-01-21 | 1982-06-29 | Sony Corporation | Compander circuit which produces variable pre-emphasis and de-emphasis |
-
1980
- 1980-09-03 JP JP55121208A patent/JPS5746517A/ja active Granted
-
1981
- 1981-08-28 GB GB8126309A patent/GB2083985B/en not_active Expired
- 1981-08-31 US US06/298,099 patent/US4427950A/en not_active Expired - Lifetime
- 1981-08-31 FR FR8116588A patent/FR2489573B1/fr not_active Expired
- 1981-09-02 DE DE3134669A patent/DE3134669C2/de not_active Expired - Lifetime
- 1981-09-02 CA CA000385054A patent/CA1178210A/en not_active Expired
- 1981-09-02 IT IT23755/81A patent/IT1138559B/it active
- 1981-09-02 BE BE2/59328A patent/BE890183A/fr not_active IP Right Cessation
- 1981-09-03 KR KR1019810003279A patent/KR880000597B1/ko not_active Expired
- 1981-09-03 CH CH5677/81A patent/CH653795A5/de not_active IP Right Cessation
- 1981-09-03 AT AT0381181A patent/AT374938B/de not_active IP Right Cessation
- 1981-09-03 NL NL8104090A patent/NL191723C/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL191723C (nl) | 1996-04-02 |
| NL191723B (nl) | 1995-12-01 |
| JPS5746517A (en) | 1982-03-17 |
| NL8104090A (nl) | 1982-04-01 |
| KR880000597B1 (ko) | 1988-04-16 |
| CH653795A5 (de) | 1986-01-15 |
| KR830008280A (ko) | 1983-11-16 |
| BE890183A (fr) | 1982-01-04 |
| FR2489573B1 (fr) | 1985-12-13 |
| FR2489573A1 (fr) | 1982-03-05 |
| IT8123755A0 (it) | 1981-09-02 |
| DE3134669A1 (de) | 1982-05-06 |
| GB2083985B (en) | 1984-10-31 |
| US4427950A (en) | 1984-01-24 |
| AT374938B (de) | 1984-06-12 |
| DE3134669C2 (de) | 1995-01-05 |
| JPH0123963B2 (OSRAM) | 1989-05-09 |
| IT1138559B (it) | 1986-09-17 |
| GB2083985A (en) | 1982-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |